Update helmet: 3.12.1 → 3.13.0 (minor)

[depfu]

We've updated a dependency and here is what you need to know:

name	version specification	old version	new version
helmet	^3.12.1	3.12.1	3.13.0

You should probably take a good look at the info here and the test results before merging this pull request, of course.

What changed?

✳️ helmet (3.12.1 → 3.13.0) · Repo · Changelog

Commits

See the full diff on Github. The new version differs by 14 commits:

• 3.13.0
• Update changelog for 3.13.0 release
• Travis should test on Node 10 instead of Node 8
• var → const in README
• Remove Standard badge from readme
• security.md -> SECURITY.md
• Use const instead of var in tests
• Add helmet.permittedCrossDomainPolicies middleware
• Revert "Travis should test on Node 0.10 because we still technically support it"
• Travis should test on Node 0.10 because we still technically support it
• 3.12.2
• Update changelog for 3.12.2 release
• Update to helmet-csp@2.7.1
• Fix CONTRIBUTING.md not being npm ignored

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